← Square any 2-digit number: up and down lesson New set →

Squaring 2-Digit Numbers Mentally Worksheet

Mental maths lesson 23: Square any 2-digit number: up and down · Set 818 · 40 questions
TalentJR

How to do it in your head (Up and down): Find how far the number is from the nearest ten (the distance). Go that distance up and the same distance down, and multiply the two new numbers. Add the distance squared.

NameDateTime takenScore ___ / 40
  1. 1.49² =
  2. 2.75² =
  3. 3.59² =
  4. 4.41² =
  5. 5.68² =
  6. 6.95² =
  7. 7.93² =
  8. 8.62² =
  9. 9.98² =
  10. 10.31² =
  11. 11.71² =
  12. 12.91² =
  13. 13.89² =
  14. 14.57² =
  15. 15.65² =
  16. 16.54² =
  17. 17.46² =
  18. 18.33² =
  19. 19.63² =
  20. 20.37² =
  21. 21.64² =
  22. 22.86² =
  23. 23.53² =
  24. 24.39² =
  25. 25.88² =
  26. 26.42² =
  27. 27.36² =
  28. 28.97² =
  29. 29.51² =
  30. 30.47² =
  31. 31.81² =
  32. 32.67² =
  33. 33.44² =
  34. 34.34² =
  35. 35.85² =
  36. 36.43² =
  37. 37.55² =
  38. 38.94² =
  39. 39.35² =
  40. 40.58² =

Answer key

  1. 2401
  2. 5625
  3. 3481
  4. 1681
  5. 4624
  6. 9025
  7. 8649
  8. 3844
  9. 9604
  10. 961
  11. 5041
  12. 8281
  13. 7921
  14. 3249
  15. 4225
  16. 2916
  17. 2116
  18. 1089
  19. 3969
  20. 1369
  21. 4096
  22. 7396
  23. 2809
  24. 1521
  25. 7744
  26. 1764
  27. 1296
  28. 9409
  29. 2601
  30. 2209
  31. 6561
  32. 4489
  33. 1936
  34. 1156
  35. 7225
  36. 1849
  37. 3025
  38. 8836
  39. 1225
  40. 3364

Free mental maths lessons, practice and worksheets at talentjr.in/mental-maths